If you are 100% certain there is no ice, then I would look for a soft compound knobby tire. The tires that came on my Specialized Rockhopper (I don't know off the top of my head what the tires are) work great in snow and cold conditions; they just don't do well on ice (which is why I went to Hakka 294s). Check out the Continental Top Contact Winter II. I've never owned a set, but they look like they would do well in the conditions you describe.